Add entry to public APIs (#857)

README.md

@@ -125,6 +125,7 @@ API | Description | Auth | HTTPS | CORS |
 | [Charity Search](http://charityapi.orghunter.com/) | Non-profit charity data | `apiKey` | No | Unknown |
 | [Clearbit Logo](https://clearbit.com/docs#logo-api) | Search for company logos and embed them in your projects | `apiKey` | Yes | Unknown |
 | [Domainsdb.info](https://domainsdb.info/) | Registered Domain Names Search | No | Yes | Unknown |
+| [Freelancer](https://developers.freelancer.com) | Hire freelancers to get work done | `OAuth` | Yes | Unknown |
 | [Gmail](https://developers.google.com/gmail/api/) | Flexible, RESTful access to the user's inbox | `OAuth` | Yes | Unknown |
 | [Google Analytics](https://developers.google.com/analytics/) | Collect, configure and analyze your data to reach the right audience | `OAuth` | Yes | Unknown |
 | [mailgun](https://www.mailgun.com/) | Email Service | `apiKey` | Yes | Unknown |